I bought a book but wish to receive a refund as I have read it
I did not realize that I had already read this book. Can I get a refund?
You probably cannot get a refund, since the terms of sale for the iTunes Store state that all sales are final. You can contact the iTunes Store, explain the reason for your request, and ask, though:
http://www.apple.com/support/itunes/contact.html
It's possible they'll make an exception for you.
Good luck.